期刊
MEDICAL PHYSICS
卷 32, 期 1, 页码 230-240出版社
WILEY
DOI: 10.1118/1.1835572
关键词
3D power deposition control; electron beams; frequency blending; hyperthermia; hyperthermia applicator; hyperthermia system; photon beams; scanned ultrasound; simultaneous thermoradiotherapy; superficial tumors; ultrasonic heating
资金
- NCI NIH HHS [R01 CA63121] Funding Source: Medline
- NATIONAL CANCER INSTITUTE [R01CA063121] Funding Source: NIH RePORTER
A new ultrasound applicator with three-dimensional power distribution control was developed for simultaneous thermoradiotherapy. The system was named SURLAS for Scanning Ultrasound Reflector Linear Arrays System. In this paper, the hardware of the first clinical grade SURLAS applicator is described with emphasis on clinically important static acoustic characteristics and on construction aspects not reported before. Functionally, the SURLAS applicator consists of two parallel opposed ultrasound linear arrays aiming their acoustic beams to a V-shape scanning ultrasound reflector, which deflects the beams coming from opposite directions toward the treatment area. The reciprocating motion of the reflector in-between the arrays spreads the ultrasonic energy over the target area scanned. Control of power deposition over the 16 cm by 16 cm treatment window area is achieved by adjusting the power input into the transducer elements of the arrays as a function of the position of the scanning reflector. Furthermore, the arrays operate at significantly different frequencies (1.9 and 4.9 MHz) so that intensity modulation of beams of different frequencies can be exploited to adjust the depth of energy penetration. With this design, external electron or photon beams can be concurrently delivered with hyperthermia by irradiating through the applicator's body. Safety features were implemented into the applicator's design to monitor its performance during operation. A detailed description of the applicator including impedance matching circuits/filters, radiation force balance power measurements, hydrophone pressure field distribution measurements, as well as safety test results are reported. (C) 2005 American Association of Physicists in Medicine.
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